Tubular steel desk-frame.



T. E. McNULTY. TUBULAR STEEL DESK FRAME.

APPLICA ION FILED MAY 3.1918

Patented Jan. 21, 1919.

2 SHEETS-SHEET I.

and shown in the THOMAS E. McNULTY, OF SAN FRANCISCO, CALIFORNIA.

TUBULAR STEEL DESK-FRAME.

Lemme.

Specification of Letters Patent.

' Patented J an. 21, 1919.

Application filed May 3, 1918 Serial N 0. 232,268.

To all whom it may concern:

Be it known that I, THOMAS E. a citizen of thcfUnited States, residing at San Francisco, in the county of San F ran ciscoand State of California, have invented certain new Tubular Steel Desk-Frames, following is a specification.

This invention relates to a tubular steel construction for the frames of school desks and includes novel means for attaching the back, seat and desk to said frame so that all three, viz. the back, seat and desk, are adjustable relative to the frame and to each other.

The tubular frame construction is not only durable but is strong and sanitary, and the various adjustments allow the fitting of each desk to the size of the particular pupil to whom it may be assigned. In case of reassignment the proper adjustments can be Fifadily made to accommodate the new upi p The invention also includes the novel features of construction and operation hereinafter described. pointed out in the claims, accompanying drawings,

MCNULTY,

of which the in which:

Figure 1 is a side elevation, looking to ward a seat and the back of a desk.

Fig. 2 is an end elevation.

Fig. 3 is a side elevation of the rear of the desk, the seat and seat back being removed.

Fig. 4 is a detail view of a seat back hanger plate.

Fig. 5 is broken out.

In constructing the desk as shown I employ a metal tubular A-shaped frame 1. one being provided for each end of the desk. each frame having a curved bow portion 2 at the top and suitable foot portions 3 at the r lower ends. Each frame 1 is also provided with two cross braces 4 welded or brazed to the frames. A tubular cross piece 5 detachably connects the bow portions of the two frames.

A lower tubular member 6 connects the two upper crosspieces 4. Extending between the tubular cross members 5 and 6 are seat back supporting bars 7, the lower ends of the bars being angled as at 8 to engage the tubular member 6. These bars are provided with suitable openings 9 and support the seat back members 10. The back pieces are a section through the desk,

and useful Improvements in adjustably connected to the bars by means of plates 11 secured to the backs and provided at their upper ends with hook members 12 to engage the openings 9. After the proper adjustment of the back pieces have been made they are locked in such adjusted position by a bolt and nut, as at 11.

A seat 13 provided with end castings 14 is mounted between brackets 15, the brackets being V-shaped and having sleeves 16 at their ends that slidably engage rear n'lembers of the frame 1. To support and adjust the scat, arms IZare extended from the upper ends of the brackets 15 and through said arms loosely pass adjusting screws 18. The arms 17 reston and are supported by nuts 19 and lock nuts 20 are placed on the screws above the arms. A scale in inches and fractions thereof is laid off on the rear mem' bers of the frame 1, as at 21, and by turning the nuts on the screws 18 the seat can be adjusted the desired number of inches above the floor to accommodate the pupil using the seat.

An extension desk top 22 is provided with cleats 23 adapted to slide in guides 24 carried by pressed steel side members 25. These side members carry semi-cylindrical brackets 26 adapted to bear and.slide on the front members of the frame 1, bein clamped thereto by screw and nut as at 27.

A brace 28 connects each side member 25 with its bracket 26.

Vertical adiustment of the desk bv sliding movement of the brackets 26 along the frame 1 is provided for by securing U- shaped plates 29 to the side members. said plates partially embracing the frame 1. Blocks 30 are secured to the plates and in the blocks I mount a threaded shaft 31. This shaft passes through a block secured to the desk back. 22, and the shaft 31 is oppositely threaded on opposite sides of the block 32. An end of the shaft projects and is squared. as at 33. to receive a wrench. Thread blocks 34 having pins 34" are mounted on the shaft on opposite sides of the block 32. Links 35 are pivoted respectivelv to said pins and to plates 37, as at 36. which plates are secured to the frame 1. On rotation of the shaft 31 the thread blocks 34 will be moved along it, thereby raising or lowering the links 35. according; to direction of the travel of the blocks. thus raising or lowering the desk. the plates 29 and brackets 26 sliding on the frame 1.

The links also aid in supporting the desk meets all sanitary requn'ements,andis j gienic in its operat on.

What I claim 1s:- L H 1. In a desk, tubular Aashape'd frames, a

tubular member connecting the apic'es of the, frames, cross pieces carried by 'the frames,

[from the upperconnecting member and hav in-g] their lower ends, angled inwardly to engage the lower connecting member, means a tubular memberconnecting said cross pieces and in the Vertical plane of the first mentioned tubular memben a seat vertically siidable along said frames, a desk also movthe first mentioned tubular member and angled to engage the second mentioned tubular.

.from'the back and 'means for the frames,

member,'and seat, back members ad'justabiy supported by the bars.

A-shaped end frames, cross pieces for said frames, a cross piece-con-v 2. In a desk,

ne ctingtheapices of the frames, a lower Copies of this patent maybe obtained for the use of material,

of thezframes and the absence supported by cross pieces of the frames, a desk supportedby the front memhers of the frames, a seat supported from the rear members of the frames, bars connected to" the cross piece connecting the apices of the frames and to the cross piece supported by the cross pieces of the frames, and seat backs supported by said bars.

" 3. A desk framecomprising A-shaped end frames, each framehaving cross pieces, up-

I per andlower frame connecting members,

the" upper'one be ng secured. to the aplces lower one toa cross piece of eachframe, depending :bars'hung for adjustably securing a, seat back to the able along said frames, bars connected to ,lba'rs, a seat slidably' mounted on the frames,

and-below the bars, and a desk slidably mounted ontheopposite sides of the frames seat, with independent sliding the'seat and back along as and for the purpose set forth: In testimony whereof I afliX. my signature. i THOMAS EJMGNULTY.

fine cents each, by addressing the Commissioner .02 Enterit s, .Washing ton,JD. 0. i r 

